Posterior Forearm Compartment

Question 1

Brachioradialis - O & I

Answer 1

O: Proximal 2/3 of lateral supracondylar ridge of humerus
I: Styloid process of radius

Question 2

Brachioradialis - F & N

Answer 2

F: 1) Flex. of forearm @ elbow J
2) supination of forearm @ radioulnar J (to mid position)
3) Pronation of forearm @ radioulnar J (to mid pos.)
N: Radial nerve

Question 3

Flexor carpi radialis longus - O & I

Answer 3

O: Distal 1/3 of lateral supracondylar ridge of humerus
I: Base of second metacarpal bone

Question 4

Flexor carpi radialis longus - F & N

Answer 4

F: 1) Ext. of hand @ wrist ABD. (Radial deviation) Of hand @ wrist J
N: Radial nerve

Question 5

Extensor carpi radialis brevis - O & I

Answer 5

O: Lateral epicondyle of humerus (via common extensor tendon)
I: Base of 3rd metacarpal bone

Question 6

Extensor carpi radialis brevis - F & N

Answer 6

F: 1) Ext. of hand @ wrist J
2) ABD. (Radial deviation) of hand @ wrist J
N: Radial nerve

Question 7

Extensor DIgitorum - O & I

Answer 7

O: Lateral epicondyle of humerus (via common extensor tendon
I: Distal and middle phalanges of fingers #2-5

Question 8

Extensor Digitorum - F & N

Answer 8

F: 1) Ext. of hand @ wrist J
2) Ext. of fingers #2-5 @ MCP, PIP and DIP J
N: Radial nerve

Question 9

Extensor Digiti Minimi (EDM) - O & I

Answer 9

O: Lateral epicondyle of humerus (via common flexor tendon)
I: Middle and distal phalanges of little finger (via its dorsal digital expansion)

Question 10

Extensor Digiti Minimi (EDM) - F & N

Answer 10

F: 1) Ext. of little finger @ MCP, PIP, and DIP Js
2) Ext. of hand @ wrist J
N: Radial nerve

Question 11

Extensor Carpi Ulnaris (ECU) - O & I

Answer 11

O: Lateral epicondyle of humerus (via common extensor tendon) & Middle posterior border of ulna
I: Base of 5th metacarpal bone

Question 12

Extensor Carpi Ulnaris (ECU) - F & N

Answer 12

F: 1) Ext. of hand @ wrist J
2) ADD. (Ulnar deviation) of hand @ wrist J
N: Radial nerve

Question 13

Anconeus - O & I

Answer 13

O: Lateral epicondyle of humerus (via common extensor tendon)
I: Olecranon process of ulna & Proximal of the shaft of ulna

Question 14

Anconeus - F & N

Answer 14

F:
N:

Question 15

Supinator - O & I

Answer 15

O: Supinator crest of ulna; Lateral epicondyle of humerus
I: Proximal 1/3 of lateral surface of radius

Question 16

Supinator - F & N

Answer 16

F: 1) Supination of forearm @ radioulnar J
N: Radial nerve

Question 17

Abductor Pollicis Longus (APL) - O & I

Answer 17

O: Middle of posterior surface of radius, ulna, and interosseous membrane
I:Base of 1st metacarpal bone

Question 18

Abductor Pollicis Longus (APL) - F & N

Answer 18

F: ABD. Of thumb @ CMC J
N: Radial nerve

Question 19

Extensor Pollicis Brevis (EPB) - O & I

Answer 19

O: Distal 1/3 of posterior surface of radius and interosseous membrane
I: Base of proximal phalanx of thumb

Question 20

Extensor Pollicis Brevis (EPB) - F & N

Answer 20

F: 1) Ext. of thumb @CMC and MCP Js
N: Radial nerve

Question 21

Extensor Pollicis Longus (EPL) - O & I

Answer 21

O: Middle 1/3 of posterior surface of ulna and interosseous membrane
I: Base of distal phalanx of thumb

Question 22

Extensor Pollicis Longus (EPL) - F & N

Answer 22

F: 1) Ext. of thumb @ CMC, MCP & IP Js.
N: Radial nerve

Question 23

Extensor Indicis (EI) - O & I

Answer 23

O: Distal 1/3 of posterior surface of ulna and interosseous membrane
I: Dorsal digital expansion of the 2nd finger

Question 24

Extensor Indicis (EI) - F & N

Answer 24

F: 1) Ext. of index finger @ MCP, PIP, DIP Js
2) Ext. of hand @ wrist J
N: Radial nerve